<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>

<script>
// 创建数组
var  arr = [1,2,3,4,2,5,6,2,7,2];
// index表示新数组newarr的下标，默认为0
var  index = 0,newarr = [];
// 遍历数组
for(var i in arr){
    // 数组元素不全等于2,则将其保存到newarr中
    if(arr[i] !== 2){
        newarr[index] = arr[i];
        ++index;
    }
}

</script>
</body>
</html>